/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: Jiang Jinxi
 * Date: 2024-08-31
 * Time: 14:34
 */
class Singleton{
    private static Singleton instance = new Singleton();
    public Singleton getInstance(){
        return instance;
    }
    private Singleton(){

    }
}
public class Demo21 {

}
